Avaya IP Office Combo Card ATM v2 blowing up, twice now. 1

[Tele-tech]

Hey folks,

We have a new customer with an Avaya IP office, who about 7 months ago we swapped out a blown up combo card. We swapped in a replacement(IPO 500 ATMU-V2), and last week it blew a transistor in what I believe was the same spot. I took the system off the wall, took a look inside, and can't see any other immediate damage to the motherboard. Power supply looked fine as well(again, this was all just a surface look).

We do have a Panamax surge protector on the line, and the CO lines coming in are via a Rogers(broadband) modem, which is just essentially a coax VoIP modem.

When I arrived on site, the CO lines on the card were green, but all sets were down and no lights on the DS portion of the card. Nothing was plugged into the analog ports.

Here are pictures of the card:

Bottom

Close Up Bottom

Bottom card, top view with top card removed

Top and Front

Anyone have any idea why a system would blow up two cards within the span of 7 months?

 

[holdmusic34]

Is the system correctly earthed, using the earth screw connector on the back of the chassis?

Also, could be an issue with the backplane. May wish to jump the combo card to another slot, if possible.

remembering Intrigrant 2019

 

[sizbut]

The damage is on the circuits for the extension ports, not the lines. Apart from the earthing as holdmusic34 says, I would be checking all the wiring on that side plus the actual devices that are being connected.

Stuck in a never ending cycle of file copying.

 

[Ekster]

Bet there is a PC LAN card miss-patched to the port.

I wish Avaya would build in some sort of protection against this eventuality

“Some humans would do anything to see if it was possible to do it.
If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH'.
The paint wouldn't even have time to dry.”

Terry Pratchet